美国一直升机从上空抛撒大量美元【看世界·新闻早知道】

Group 1 - The article discusses a unique event in Detroit where a helicopter dropped a large amount of US dollar bills, which were collected by excited citizens [1] - The money drop was a gesture from the son of a car wash owner who recently passed away from Alzheimer's disease, fulfilling his father's wish to bless the community [1] Group 2 - The article does not contain relevant information regarding companies or industries.